internal void SetModified(BaseProperty property, bool?value)
{
var col = property?.Column ?? -1;
if (col >= 0 && col < Modified.Count)
{
Modified[col] = value;
}
}
internal void SetEditing(BaseProperty property, bool value)
{
var col = property?.Column ?? -1;
if (col >= 0 && col < Editing.Length)
{
Editing[col] = value;
}
}
internal void SetEditable(BaseProperty property, bool?value)
{
var col = property?.Column ?? -1;
if (col >= 0 && col < Editable.Count)
{
Editable[col] = value;
}
}
/// <summary>
/// Stores specified change to the given property to listen to,
/// or adds the change to the stored property, if one already exists.
/// </summary>
/// <param name="prop">The property to listen to.</param>
/// <param name="change">The property change to listen to.</param>
protected void AddPropertyChange(BaseProperty prop, PropertyChange change)
{
if (properties.ContainsKey(prop))
{
properties[prop] = properties[prop] + change;
}
else
{
properties[prop] = change;
}
}
/// <summary>
/// Constructs a new computed binding for updating property editability.
/// </summary>
/// <param name="property">The property to update based on the computed result.</param>
/// <param name="expression">Lambda expression used to compute the result.</param>
/// <param name="args">Arguments for the specified expression to use for evaluation.</param>
public ComputedEditableBinding(BaseProperty property, LambdaExpression expression, params object[] args)
: base(property, expression, args)
{
if (property == null)
{
throw new ArgumentException("Property cannot be null", nameof(property));
}
if (expression.ReturnType != typeof(bool))
{
throw new Exception("Supplied expression should return a bool.");
}
}
/// <summary>
/// Constructs a new computed binding for the property using the specified expression and concrete arguments.
/// </summary>
/// <param name="property">The property to update based on the computed result.</param>
/// <param name="expression">Lambda expression used to compute the result.</param>
/// <param name="args">Arguments for the specified expression to use for evaluation.</param>
public ComputedBinding(BaseProperty property, LambdaExpression expression, params object[] args)
{
this.property = property;
compiledExpression = expression.Compile();
IEnumerable <ParameterExpression> parameters = expression.Parameters;
// last parameter can be dynamic data row not provided in the args
if (parameters.Count() == args.Length + 1 && parameters.Last().Type == typeof(DataRow))
{
rowArg = parameters.Last().Name;
parameters = parameters.Take(parameters.Count() - 1);
}
if (parameters.Count() != args.Length)
{
throw new ArgumentException($"The number of arguments should match the number of expression parameters", nameof(args));
}
for (int i = 0; i < args.Length; i++)
{
namedArgs[expression.Parameters[i].Name] = args[i];
}
Visit(expression);
foreach (var p in properties.Keys)
{
// subscribe to both sync and async, so that we could update using appropriate mode based on IsAsyc of the event
p.Change += Recompute;
p.AsyncChange += RecomputeAsync;
}
foreach (var o in objects.Keys)
{
o.PropertyChanged += Recompute;
}
foreach (var s in selectionLists)
{
s.SelectionChanged += RecomputeOnSelection;
}
}
/// <summary>
/// Allows controlling property editability on the data object level.
/// Subclasses can override this method to define custom rules
/// for property editability.
/// </summary>
/// <param name="p">The property to check the editability of.</param>
/// <returns>True if the property should be editable, false otherwise.</returns>
public virtual bool IsPropertyEditable(BaseProperty p)
{
return(Editable && (parent == null || parent.IsPropertyEditable(p)));
}
/// <summary>
/// Allows controlling property visibility on the data object level.
/// </summary>
/// <param name="p">The property to check the visibility of.</param>
/// <returns>True if the property should be visible, false otherwise.</returns>
public virtual bool IsPropertyVisible(BaseProperty p)
{
return(parent == null || parent.IsPropertyVisible(p));
}
/// <summary>
/// Allows controlling if the property is required on the data object level.
/// </summary>
/// <param name="p">The property being checked if it's required.</param>
/// <returns>True if the property should be required, false otherwise.</returns>
public virtual bool IsPropertyRequired(BaseProperty p)
{
return(parent == null || parent.IsPropertyRequired(p));
}
/// <summary>
/// Allows controlling property visibility on the data object level.
/// </summary>
/// <param name="p">The property to check the visibility of.</param>
/// <returns>True if the property should be visible, false otherwise.</returns>
public virtual bool IsPropertyVisible(BaseProperty p)
{
return parent == null || parent.IsPropertyVisible(p);
}
/// <summary>
/// Allows controlling if the property is required on the data object level.
/// </summary>
/// <param name="p">The property being checked if it's required.</param>
/// <returns>True if the property should be required, false otherwise.</returns>
public virtual bool IsPropertyRequired(BaseProperty p)
{
return parent == null || parent.IsPropertyRequired(p);
}
/// <summary>
/// Allows controlling property editability on the data object level.
/// Subclasses can override this method to define custom rules
/// for property editability.
/// </summary>
/// <param name="p">The property to check the editability of.</param>
/// <returns>True if the property should be editable, false otherwise.</returns>
public virtual bool IsPropertyEditable(BaseProperty p)
{
return Editable && (parent == null || parent.IsPropertyEditable(p));
}
internal bool?GetModified(BaseProperty property)
{
var col = property?.Column ?? -1;
return(col >= 0 && col < Modified.Count ? Modified[col] : null);
}
internal bool GetEditing(BaseProperty property)
{
var col = property?.Column ?? -1;
return(col >= 0 && col < Editing.Length && Editing[col]);
}
internal bool?GetEditable(BaseProperty property)
{
var col = property?.Column ?? -1;
return(col >= 0 && col < Editable.Count ? Editable[col] : null);
}
